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Note 16 - Customers (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Concentration Risk, Customer | 10% |  |  |  |
Concentration Risk, Percentage | 15.00% |  | [1] |  | [1]
Receivables, Long-term Contracts or Programs | $ 70,815 | $ 74,875 |  |  |
NTTA [Member] |  |  |  |  |
Receivables, Long-term Contracts or Programs | 8,800 |  |  |  |
UDOT [Member] |  |  |  |  |
Receivables, Long-term Contracts or Programs |  | 8,800 |  | 10,100 |
TxDOT [Member] | Accounts Receivable [Member] |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00% |
TxDOT [Member] |  |  |  |  |
Receivables, Long-term Contracts or Programs |  |  |  | 10,800 |
Utah Transit Authority [Member] |  |  |  |  |
Receivables, Long-term Contracts or Programs |  | $ 9,600 |  |  |
Less Than [Member] |  |  |  |  |
Concentration Risk, Percentage | 10.00% |  |  |  |
Accounts Receivable [Member] |  |  |  |  |
Concentration Risk, Percentage | 10.00% | 10.00% |  |  |
[1] | Represents less than 10% of revenues

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant